Bank subsidiary (Details 7) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Credit risk profile based on payment activity for loans
30-59 days past due	$ 8,619	$ 12,412
60-89 days past due	6,347	6,895
Greater than 90 days	53,913	57,946
Total past due	68,879	77,253
Current	3,565,711	3,468,803
Total financing receivables	3,634,590	3,546,056
Recorded Investment greater than 90 days and accruing	502	965
Residential 1-4 family
Credit risk profile based on payment activity for loans
30-59 days past due	4,775	8,245
60-89 days past due	2,837	3,719
Greater than 90 days	34,942	36,419
Total past due	42,554	48,383
Current	1,985,948	2,039,430
Total financing receivables	2,028,502	2,087,813
Commercial real estate
Credit risk profile based on payment activity for loans
60-89 days past due		4
Total past due		4
Current	321,967	300,685
Total financing receivables	321,967	300,689
Home equity line of credit
Credit risk profile based on payment activity for loans
30-59 days past due	993	1,103
60-89 days past due	729	227
Greater than 90 days	1,492	1,659
Total past due	3,214	2,989
Current	463,569	413,464
Total financing receivables	466,783	416,453
Residential land
Credit risk profile based on payment activity for loans
30-59 days past due	968	1,543
60-89 days past due	834	1,218
Greater than 90 days	14,027	16,060
Total past due	15,829	18,821
Current	36,072	46,778
Total financing receivables	51,901	65,599
Recorded Investment greater than 90 days and accruing		581
Commercial construction
Credit risk profile based on payment activity for loans
Current	38,419	38,079
Total financing receivables	38,419	38,079
Residential construction
Credit risk profile based on payment activity for loans
Current	3,738	5,602
Total financing receivables	3,738	5,602
Commercial loans
Credit risk profile based on payment activity for loans
30-59 days past due	1,400	892
60-89 days past due	1,667	1,317
Greater than 90 days	2,837	3,191
Total past due	5,904	5,400
Current	634,317	546,283
Total financing receivables	640,221	551,683
Recorded Investment greater than 90 days and accruing	60	64
Consumer loans
Credit risk profile based on payment activity for loans
30-59 days past due	483	629
60-89 days past due	280	410
Greater than 90 days	615	617
Total past due	1,378	1,656
Current	81,681	78,482
Total financing receivables	83,059	80,138
Recorded Investment greater than 90 days and accruing	$ 442	$ 320